Shear design of full-scale prestressed SFRC girders


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Title: Shear design of full-scale prestressed SFRC girders

Author(s): Tim Soetens; Stijn Matthys

Publication: Special Publication

Volume: 310


Appears on pages(s): 151-160

Keywords: Shear design, prestressed girder, Model Code, steel-fibre-reinforced concrete.

Date: 3/17/2017

Pretensioned precast concrete girders are mainly designed to resist high bending moments. Although limited shear forces act on these girders, a minimal amount of web reinforcement should be added in order to meet design code requirements. Since the cutting, bending and placing of stirrups is a labour-intensive job, a possible alternative can be the replacement of stirrups by adding fibres to the concrete. By using steel-fibre-reinforced concrete (SFRC), the production process of precast elements can be shortened and costs reduced significantly. In order to investigate the shear capacity of full-scale prestressed fibre-reinforced concrete elements, an experimental programme was carried out on 20 m span precast girders. Additionally, standard prisms were cast from the same concrete batch to derive the postcracking behaviour of the SFRC. The ultimate shear capacity of all the girders is evaluated with respect to the current shear design provisions for SFRC according to the fib Model Code for Concrete Structures 2010.